Depends on what you want them for. The good ones do a good job of dealing with road buzz and taking the edge of small hits. But they're not really a valid alternative for a full-suspension bike.
Not really. There's no hinge for it, and no place for the suspension to go. You'd basically have to cut the bike apart to create the hinge to allow the suspension to move, and then you'd have to build the attachment points for the suspension. It's really not worth the huge effort it'd take.
The best? Think in terms of $1,000 and up. A very good BMX bike can bought for $500, though.
700,000
700,000
20 bux
Mongoose bikes are a great brand name for bikes, but they can often be prohibitively expensive for people that are on a bit of a budget. Because of this, you should really put some thought into your next bike purchase. While it may seem like spending the extra money is worth it at the time, there are many different "generic" brands out there that offer the same level of quality that Mongoose bikes can offer you.
A penny farthing in fair to good condition, can be worth between £800 to £1500.
The best exercise bikes tend to be Schwinns, with the 240 and Airdyne topping the list. The Marcy ME 709 and Stamina 5325 are also both excellent bikes and well worth considering.
Most bikes are made in Asian countries, but small-scale production of more expensive bikes exists in most countries.
Not really Ebay took all the posts down a couple of weeks ago, i dont think anyone bought the phones. You can just jailbreak your phone and still get it.
What ever someone is willing to pay
Generally speaking bikes rarely turn into valuable collectibles, so your best bet is to check craigslist, ebay for similar bikes and see what they sell for.