[Simicsignet]

Depends what you define "pretty penny as. After beginning to collect DCUC recently I can say that all of these figures have eluded me due to high price points on Ebay. I'm of course equating higher average Ebay price with higher rarity.

Wave 2 Harley Quinn 30+ and Aquaman(Short or long) 40+
Wave 3 Sinestro(Yellow)50+, Robin 40+ and Nightwing 40+

Wave 5
Wave 8 Gentleman Ghost 50+

Two Packs
Green Lantern/Abin Sur 50+

Exclusives
Gleek 80+
Lobo 70+

Only counting carded figures of course. Some of these figures notably the majority of wave 3 are pretty pricey relative to MSRP odd to me considering Wave 1 and 2 seem plentiful.