I have been searching on eBay for a good used double stroller. We have a 2 yo and expect #2 in late October. Perego Tender, and Combi Twin Spin tend to pop up fairly often. I realize that the Combi was discontinued a few years ago. I am quite tempted by its (the Combi) light weight though. They retail for such a high price, does anyone have an opinion of what fair market value would be for these items when they are 4-5 years old? Thanks.