My local store is doing a half price promotion on memory cards, Lots and lots of little yellow offer labels going up on memory cards that fit into mobile phones and cameras.
Tesco finally seem to be matching or bettering their prices with ones seen online such as Play.com.
The two mentioned on the posting title were the ones i noted specifically but they also had offers on M2 cards (of various sizes), XD cards (of various sizes), And SD and Compact flash cards of various sizes (some double packs too)
I didnt notice any Pro Duo cards but then my local Tescos electricals section is not very big.
So if your popping in check out the mobile phone/electricals/offers aisle and there might be a bargain to be found. Clubcard points too!