10 block of wax from hobby lobby, and with the online 40% off coupon I only paid about $14 for it. I used one of these sure forms to make nice little wax shavings out of that block. I'm always a little disappointed afterward though...looking in the mirror you would think my arms would be more jacked after working that sure form on a big block of wax...but they aren't. Sigh...I guess I will never be a well built dude, oh well...
Then I dump a full five gallon bucket full of dry, presifted dirt into one of these old thick black plastic mixing tubs I bought from menards a few years back. Add the right amount of wax shavings and mix it all up with gloves on and a little garden trowel, looks like this when all mixed up. The white wax flakes are showing in the dry sifted dirt.
And after a hot day in sun under the truck's black tonneau cover, with truck sitting out in parking lot at work all day, mix it up again to make sure there are no clumps and that all of the wax was melted. If needed, let it sit another hot day to get rest of the wax melted if necessary. Sometimes it takes me a day or two but on a good hot day one day does the trick. Mix it all back up to make sure all of the wax was melted in. Once the dirt is cooled, I cut the top half of a two liter soft drink bottle (clean) as a funnel to transfer the dirt into clean milk jugs I've saved throughout the summer. With two boys, we go through plenty of milk around here. The opening on the two liter soft drink bottle fits nicely into the opening on top of a gallon milk jug, and a darn cheap funnel for this purpose.

You can carry a gallon of dry waxed dirt very easily in these clean milk jugs, and they pour very well into a trap bed, too. I stash these jugs ahead of time at each set location. Put them nearby in a weedy fencerow or brush pile. Easy on remakes to walk over, grab the jug, do the remake, put the jug back afterward. Be sure to pick them all up at end of the season. I learned the stashing dirt trick from Charles Dobbins' land trapping book, and have done this since probably about late '80s on our winter coyote line.
After season is over, you can keep the leftover waxed dirt already put up in the jugs in a dry shed or garage and good to go for the next season, too.
Anyway...your original question of cost savings to buy or make your own, it's way cheaper to make your own. I ran out one season and bought a couple bags from a dealer. It cost me about $24 for each bag plus shipping was about $10-$15 on top of that.
I can make my own with hobby lobby pure paraffin candle wax 10 lb. block is about $24 but with the 40% off online coupon I think I paid about $14-$15 for the block. That coupon is for purchase of one item only so if you go in and buy two blocks they only apply the coupon to one of the blocks. Make a second trip for the second block and use another online coupon or have a friend do this for you for the second block. I already owned the sure form tool but those are not very expensive either. I've seen postings where guys used block planes to shave the wax, or even putting chunks of wax into an old food processer to make shavings.
As for melting the wax, you've read all the postings of heat sources. A cement mixer and weed burner, or a heat lamp, heat gun, oven, frying pan, electric roaster, you name it. I learned this tonneau cover trick from F&T guys and it works just fine you just need a nice hot day in mid 90s or so and several hours of the truck sitting out in direct sunlight. Mine does this sits in a hot concrete parking lot all day at work so I take advantage of hot days by making wax dirt while I am at work.
Dirt, get that from wherever you can locally and sift it before adding the wax. I have probably never used the same dirt source two seasons in a row. Sometimes I get it from under local farms and under bridges in summer, you name it. I had access to some nice pulverized dirt this year and I dried and sifted about 40 gallons of it at the time. I loaded a lot of five gallon buckets I recall, and after sifting had about that much of good useable sifted dry dirt. I tossed a lot though, big chunks, rocks, stuff I didn't want to use. Five gallon bucket of unsifted dirt is not same as five gallons of sifted dirt, if that makes sense.
Point is, it is a WHOLE lot cheaper to make waxed dirt yourself, but you do have to do a little planning and put some work into it.
Jim
