I've read of people finding success using LifeScan OneTouch UltraMini from Walgreens.
"To get low-carb right, you need to check blood sugars" blog.trackyourplaque.com/2010/01/to-get-lo
From the article:
"...Doing this myself, I have been shocked at the times Iíve had an unexpectedly high blood sugar from seemingly ďsafeí foods, or when a store- or restaurant-bought meal had some concealed source of sugar or carbohydrate. (I recently had a restaurant meal of a turkey burger with cheese, mixed salad with balsamic vinegar dressing, along with a few bites of my wifeís veggie omelet. Blood sugar one hour later: 127 mg/dl. I believe sugar added to the salad dressing was the culprit.)
You can now purchase your own blood glucose monitor at stores like Walmart and Walgreens for $10-20. You will also need to purchase the fingerstick lancets and test strips; the test strips are the most costly part of the picture, usually running $0.50 to $1.00 per test strip. But since people without diabetes check their blood sugar only occasionally, the cost of the test strips is, over time, modest. Iíve had several devices over the years, but my current favorite for ease-of-use is the LifeScan OneTouch UltraMini that cost me $18.99 at Walgreens...."