Drywood Termite repellent (external)

You said both contractors "think" you have termites. They should know and be able to point out evidence like Tester101 pointed out. Both prices seem high for just basically spraying, especially since you don't have a slab that has to be drilled through. Near the front door, they could have just came in under the door. If they are subterranean, their should be evidence of how they got in - typically mud trails coming up from dirt, up the piers and into the house. They can also look for any things that are conducive to attracting them, such as any boards (pressure treated or not) that are in contact with both the house and the dirt. Just because you have seen a few doesn't mean they are already in your walls. A less expensive spraying might take care of it. I would call another guy and see what he thinks.

I've seen bees do the same kind of damage, however those are small holes. I have also seen the smaller almost yellow jacket looking insects burrow into wood also, but I'm no entomologist so I couldn't tell you whathat they may be. I do know that spraying some wasp killer into those holes will most likely get rid of the problem if you don't wanna pay an exterminator. Those bees would burrow into the wooden beams on the outside porch. To eradicate them I'd plug all the holes but one and spray into the remaining exit, but they always come back. I've not seen them indoors though. Edit* Just remembered another method of eradication - WD40 works just fine, and the tiny straw will fit right in those holes. Hope that helps.