Better be less than 6 ft for the Byer. I'm 5'10" and I don't find it very comfortable. Sometimes you can get it on sale for less than $30 - I bought two for that price.
As for tarp, your options are extremely limited at that price point. Many have tried the Guide Gear 16 x 16 and have been happy (I'm not one of them), but I'm still experimenting with it. They are $26.97 at Sportsman's Guide. In past years they sold out quickly but they are still available (probably due to quality issues).