Upgraded Athearn rolling stock many roads flexable pricing & shipping costs

Description

I have 52 used HO rolling stock units. They are mostly Athearn Blue Box. They are upgraded with the following; Intermountain metal wheel sets (there are none better IMHO), Kadee metal whisker couplers (there are none better IMHO) The couplers are all at correct height measured by Kadee coupler height gauge. The weights on the bottom are all sanded and painted black. All cars are within grams of NMRA weight standards. All trucks have Phillips head screws securing them. Much easier to work with in the unlikely event of a failure ;D There .00 worth of upgrades per car.
Contact me with questions. Shipping and item costs can be quite flexible. If you buy several cars many discounts could/will happen. As an example off the top off my head, buy 10 cars at the buy-it-now price, free shipping and a couple of bucks off each car!
I don't really care to have stuff returned so only "if item is not as described" domestically. Also international shipping is a pain so expect to be charged appropiately for my effort. Also NO returns internationally! Thanks'
PLEASE, PLEASE, PLEASE contact me before buying multiple items !!!