There might be a few deals at some stores, but 250/300 USD is probably going to be the price you'll find at most, if not all, places (especially if you're not ordering one online I guess); of course, eBay is always an option, but I think 250/300 USD is a standard price for the PSP Value/Giga Pack. I saw a few online retailers that offered the PSP Value Pack for a little under 250, but it wasn't much less (like 230-240), and it may not be worth it since I had never even heard of some of the stores. I think Overstock.com has a $9 off a $150 purchase deal (so like ~$240 for the Value Pack), but I don't think they're doing a deal like the one mentioned earlier. I don't see any other deals at the moment unfortunately.
be a price cut in the near future, but that's about the only other option you have if you want to get one for less than 250-300.
As for NFL and NBA games, there's really only like Madden 06, NFL Street, NBA Street, NBA Live 06, and NBA 06 I believe. I think the only decent-to-good ones are Madden and Live though; the rest are a notch or two below them and probably not worth a purchase unless you find a good deal on them.
I am a little confused by what you meant when you listed the 300-330 USD. Was this including the PSP, or for just each PSP game? I'm assuming the former since PSP games only cost like 40-50 USD here, so that would seem about right (250/300 USD for the PSP + 40-100 USD for game(s) = 290-350 USD). That makes the most sense, but I've seen other countries get screwed big time with game prices from time to time.