I won't go into Radiant Raiment. I bought a beautiful fur hat for 125 gold, and I walk next door to Bits and Pieces and see the same hat for 25 gold.
I guess the mark up at RR is for the employee's eloquent demeanor.

One of my characters took all the Speech perks involving merchants, which meant I got the best prices possible and they had the most possible gold to offer and I could sell anything to anyone. I was also very handy with enchanting and alchemy.
Late in the game I used to LOVE going in there decked out in as much Fortify Barter gear as possible. I'd walk right up to the counter, be greeted in the usual oh-so-warm fashion, and then chug a big ol' Fortify Barter potion. Then I would proceed to sell them a wide variety of shovels, spiggots, raggedy-ass clothes and poop buckets at wildly inflated prices until they ran out of money to spend. Some may call that cruelty, but me... I call it justice.
