THANK YOU so much, everyone, for your helpful responses! I will contact TD to inquire about the fees charged per interaction if I need to use my ATM card in Doha.

From what's been suggested it seems like the best thing to do is to bring some of my $US cash (maybe around $200 US?), just enough to tide me over for a bit until I set myself up with a bank - and not the Islamic one mentioned.

Would it make sense to maybe bring a bank money order of a couple thousdand in $US and then set up an account to have it converted over to riyals?

Thank you, again...

:-)