You can buy PSP accessories most anywhere! Most likely you would find the Playstation Portable accessories in Wal-mart, Target, Best Buy, Gamestop or any local game shop, or an online retailer such as Amazon!
You can buy psp accessories at gamestop, target, mall stores that sell video games, walmart, and electronic stores. They sell psp accessories mostly at stores that have electronics. Hope this helps.
You can purchase accessories for your PSP at gaming stores such as Gamestop or Best Buy. Both of these stores should have a good variety and selection of accessories for your PSP.