Quoted for truth. This is why we use cans of air at work and not a compressor (which would be MUCH cheaper with our level of use).
You can get oil free compressors, they come at a bit of premium over normal compressors and have a few maintenance headaches but if you are just doing electronics and not airline tools/painting massive volumes (airbrushing and the like should be OK) you can probably get away with a cheaper one, the entry point being about £100 inc VAT -- http://www.machinemart.co.uk/shop/product/details/air-compressor1-5hp-24-litre-oil-free .