With the advent of the downgrader (Please watch out for fake ones, if in doubt ask the excellent members on this site) and the incoming new PSP firmware that will close the door to future Homebrew on the PSP, theres stil a need to source reputable companies (and not some scammer whos changed their ver number to make a quick buck) who are selling v1.5 - the homebrew compatible PSP consoles.
I checked SuccessHK just a moment ago and they still have according to the page on their site PSP v1.50s in stock (USD 279.00), at this time i couldnt find any others advertising the fact they had v1.5s in stock.