littlepea, sorry to hear your bad experience at AP (Nothing new though

). Take it as a lesson learnt.
You can never be sure of prices in place like AP and CP where there are 1000 sales reps loitering about the shop, each one quoting based on how much extra they want to earn. No consistent pricing whatsoever. Only go there if you know people there or if you get a trill from being treated like dirt and being passed over when they see jucier prey.
The only saving grace for CP is that the staff are usually quite nice (unless you're there near closing time - my experience at least) and you can try out all the display bodies, touch touch, feel feel, to your hearts content.
So far, I feel TK Foto gives the most consistent pricing (and good pricing as well) and the service is top notch.
MS Color - They were great before they got the disaster of an expansion within AMK (Who in the right frickin' mind will have 2 shops within 500m of each other?). Good service, good, consistent pricing.
They're still good now, but the prices have been creeping up. Probably to cover the overheads of 2 shopfronts.
As some others have said before, different shops have their different strengths (in terms of pricing). If you're going for the absolute best price, be prepared to do a lot of leg work.
That said, I won't touch AP with a barge pole.