@turquoise-- One of my friends got rid of her spider veins with a detox program. She eliminated all the toxins from her body and also lost the excess weight she had. I'm not sure if this will work for everyone, but it's definitely possible. I agree with @ddljohn that regular exercise helps a lot as well. I exercise four to five days a week and I don't have any spider veins.
There are also herbal products like supplements and creams on the market which claim to get rid of spider veins. I have no idea if any of those work but I highly doubt it.
Since you are worried about the cost of spider vein treatments, why don't you try to eliminate them naturally with diet and exercise first? If that doesn't work, you can always have the laser treatment done. And this way you will prevent the condition from getting worse.