I, too, have a digirtal WW scale and the first time I weight is always the losest, so I've learned to weigh once and stay off of it for the rest of the day. I try to weight first thing in the morning and if I can't then I don't weight at all. For some reason, the scale can ruin my attitude. I need it, though, because if the numbers creep back up then I know I need to modify my diet.
Do whatever works!
I find that my waist tends to go up with the scale due to bloating. But this is something I notice only at lower weights.
I weigh every single morning. I am on vacation now and yep, my scale came with me. I have charted in the past and I know when to expect spikes. I don't let it discourage me. I would rather know I am headed up immediately rather than a week into gaining.
I do think Julie is right though. Do whatever works. My scale is called a Thinline and it is from Sears. It is accurate and I have had it for a couple of years. I think it was around thirty dollars.
Surely there is a healthfood store, a school, or something around you that won't charge you for weighing though!