I buy all my bolts at www.mcmaster.com I buy all my aeropoxy which is Hysol 9462 at mcmaster.com I buy all my retract tubing at ................mcmaster.com all my fuel tubing same place. All my festo fittings that we pay so much for............ festo.com / contact local dealer through them. You can skip the BVM wheels and brakes and get similar quality (in my opinion) from great northern models. When I say bolts above, I mean every type of fastener from 4/40's to 6/32's all socket head, stainless steel or hardened alloy, there are many choices. Don't forget all the washers and blind nuts!! They are inexpensive there too. Can't think of any other places I find bargains at the moment. You have to be patient with the mcmaster website. They sell tons and tons of stuff and you have to find the "right" thing. It's offen burdensome, but you do end up with good quality stuff. Also, try harborfreight.com for shop tools. Great bargains there and have never felt cheated by what I got. Sean