If you only need something to do a few at a time there are a ton of small-capacity erasers for around $10 on ebay. If you want something of quality, check out the used Spectroline erasers; they'll have stronger lamps (faster erase) and nice heavy aluminum construction -- they were a couple hundred new but you can probably get one for < $30.
You said you're setting up a second station..
If you go through a lot of chips and might want something overkill/awesome: buy a Spectroline PC-1100A. They can be had on ebay for $50 or less and will erase 75 eproms in ~5 minutes as they have a massive cold-cathode lamp (think neon) that snakes back & forth over the entire tray. I ran across one for $10 about 10 years ago and never knew I needed it