That's how I got started a long time ago....I bought a 6322 (ISS) with one paycheck...then bought a 6316 (Envoy) with the next one. Got it up and running and then added a 6510SER (DataLogger) to get the station online. Much later I added the 6673 (sensor shelf) and a 6450 (solar sensor). I paid more over the long run but was able to stretch it out so I didnt wipe out my savings with one big purchase. Watching eBay in later years I was able to get a console on the cheap.