try ebay or cabelas. i fish with a buddy who has a 6inch lazer and drills threw 18+ inches like butter.I was wondering where you could get the attachment for the auger, I've looked around a bit but have yet to see them.....and those 20 holes, about how many inches of ice is that?
I bought one at gander mountain for $20, and one at cabelas for the same, advantage to cabelas, it has a bearing on it with a strap that goes around the drill, so if the chuck gets loose you don't have to dive in the whole after your auger. I also use an 18v lithium milwaukee drill, the advantage of lithium is that they are not effected by the cold weather at all, and last year i put about 35 holes through 12" of ice with a 5" laser on one charged battery(sharp blades are a must) we also drilled some 8" holes for tip ups, but you really have to take it easy with those.
if you are using a lazer or mora and the wing nut for attaching the adapter to your drill just get a lid off a bucket like from potato salad that is bigger than your hole.drill a 1" hole in it and slide it over your auger below the nut. If the drill comes loose that will stop the auger from falling through the hole.just be sure to find one from flexible plastic that won't crack in the cold or mom just might be missing one of her round tupperware lids too.they are even lifetime guaranteed. "gee lady, I don't know how it cracked" problem solved for freeOne suggestion if you plan to buy or build an adapter for your drill. You might want to make a plate that is bigger than the hole you drill that is a permanent part of the adapter. That way, if the adapter slips out of the drill chuck, you won't lose your auger and adapter down the hole.