Car Dollies Needed....Make or Buy??

hi all:

new house, big cellar, flat and smooth concrete floor. Need to store car inside for winter and move it occasionally to accommodate stuff.The best car dollies (Go-Jack) are about $900 for (4) tires with jack-up/down capability. Has anybody made a set of car dollies?? Any place that sells used? Looks simple to make w/ good steel wheels from Ebay (Go-Jack replacement) so maybe I can make a set of w/o jack up/down????

Appreciate the help. Comments???..Recommendations????...Bite the bullet and buy??

Thx MOPAR friends.