I think the reason that you are seeing so many cheap Pronto's all of a sudden is because Philips is trying to get rid of all the old models before the new ones come out.
There is a color 2MB version just around the corner, so grab up a cheap model while you can.
If you don't want to deal with eBay, you can also get the Pronto for $265 (w/ free shipping) from
http://www.etronixs.comRegarding Mercata, I used my new customer credit to get $100 off the price of a ReplayTV Showstopper, and I received the unit 2 or 3 days later. If you think there is an expensive item (like $500) that you might want to buy through Mercata any time soon, it might be an idea to save that new customer credit for that purchase rather than wasting it on a Pronto where it'll only save you a few bucks over the prices at etronixs or IEC.
Rob.