Would you guys get a used car (2006) checked out that you're buying from a dealer (non-bmw)?

Absolutely.

absolutely. I would go one step further and see if you can find one somewhere that is CPO. I'd also ask for a carfax report.

That is what I did and I am quite happy with my decision. Compile a list of problematic areas with the E36 and hand it to the mechanic.

if it's an 06 then I suspect it's an e90

Yes and I would make sure to take it to one of the BMW dealerships to get it checked out.

Yes, it's an e90.

Since it's only a year into the 4 yr warranty, shouldn't everything be covered still?

Oh, and how much should it cost to get it checked out by a bmw dealer?

Yes, but you still wouldn't want to be stuck with someone else's lemon even if it is covered by warranty.

Not sure, up here it's about $150 cdn.

Oh, and how much should it cost to get it checked out by a bmw dealer?
Pricing varies by shop. My local shop did a couple of pre-purchase inspections for us at no charge.

Call your local BMW dealer and ask them if they do pre-purchase inspections. If the dealers in your area have a bad reputation, try a local independent shop. Start here (http://www.bimrs.org/) to find one.

Run a Carfax on the car, but realize that it isn't perfect. You may also be able to get the car's options list and service history from your local dealer. It's called a DCS report.