I personally have never heard of it, but I aint touched my PSP in about a year. Typically, you are gonna find the BEST prices on most items at Amazon and New Egg. I'd check those sites first. Also, google (or "Bing") the product. Hope this helps.
If so, I know a place in town that has them on clearance. I'll try to go back later today. If there are some still available, I can get one for you for $20 plus shipping.