I disassembled a LOT of DVD-RW drives to make my DIY 250mW, the best drive was a LG GSA-H55N/H44N, an LPC-815, 250mW @ 400mA as The Lightning Stalker said.
The LD can be easy extrated by cracking the glue with a knife or twisting the housing.
After this, you will need to take off the Ld from it's housing, use a cutting pliers to cut the housing (destroying it) until you get the LD out. Be very carefull at this point, since is a LOC, is very sensitive!
Here the LD housing of a GSA-H55N (you can get one of this housings, but the LD are the same):
And here the LPC-815:
If you wan't a 3.8mm LD, take a look at Samsung SH-S223.
If you wan't a frame type LD, take a look at Samsung SH-S182.
Some inported LG drives have closed can LD's, but with a lot of glue, needing patience to break all the sled to extract it.
I hope I helped.