three thoughts.

first, like others posted... we wppsi'ed at 4 years 2 months. went well (and i was worried she'd have the polly pockets answer for her).

second, to find a tester - try posting a questions under regions and give a general location and have anyone pm you if they have a recommendation. worth a shot.

third, from a financial aspect you might want to wait until you may be considering early entrance or basic schooling. my guess is you want validation of what you know in your heart but your brain isn't letting you embrace. if you may need tests for early entrance next fall - you might be better off waiting until winter/early spring when more information in terms of grade leveling of skills is available. we did test at 4 but we were anticipating enrolling in K at 4.5.

Keep doing whatever it is you are doing and try to avoid thinking of the labbels and school issues that will come. oh uh, "may" come because i'm sure there are some awesome schools that aren't SUCKING the brains right out of kids ;-P teehee.