West End Games did a line of 28mm Star Wars figures for their role-playing game- it's pretty close to 1/48th. I don't remember if they did a Lando Carrission figure or any of the other Cloud City inhabitants but they did do a couple of Han, Chewie, and Leia though. They've been out of production for over a decade, I see some on Ebay now but the prices are mostly insane.
Converting the Solido figures might be a better bet.
EDIT: Ok, strike half of that, they're not in the walking poses but these might be useful. I've ordered from Noble Knight Games before- good company:
Han, Chewie, and Leia
Lando, Lobot, and Leia with blaster
Same set as 1 but with C3PO, R2D2, and a Luke you could use elsewhere
Lotsa SW figures on their site, some overpriced but some pretty reasonable.