When we were renting and moving house every couple of years, I had a big box of lightbulbs, and on moving day I'd take out all my CFLs and LED bulbs and put back all the tungsten and halogen ones that were there when we arrived on my way out, then walk into the new place and put them in, putting the existing bulbs in the box ready for storage. Now we're staying put for the foreseeable the box is in the loft...
But what I meant to say was: if you're after decent LEDs at sensible prices, CPC are often a good bet, and they'll also sell you 110° beam GU10s rather than the 40° ones most places have, which makes a massive difference to the amount of useful light you get.