Actually Q doesn't have any place with organic. There are two general stores/grocery stores in town but they are very, very small and expensive. There is also a couple of Dollar stores and a damaged package goods store (at one of the flea markets.
Blythe CA is only 20 miles down I 10 from Q. Both Smart & Final and Albertsons have good organic produce sections there. I also take advantage of the cheaper showers and free water in Ehrenberg while I'm passing through...make one day of all my errands and be done with it!
If you eat only fresh food and/or organic you'll definitely want to make the run to Blythe but you can always team up with some new friends and make an excursion of it.