eeeeek.. In short; vinyl 'pressing' is far too expensive for what your wanting and your better off sticking to cds.
The cheapest option for a 'one off' would be to get a dub plate done and this will set u back around £35 if memory serves. That would be one sided, one track really. On top of that, this wouldnt be up to being played much. You can get about 20 plays out of it before it starts detiorating badly (depending on initial quality). To get ONE tune pressed properly would cost around £400 for one 12"!!! This is ludacris for what your needs are. Obviously if you were a producer and you were funding your own tune then you would get 500 done for example and that would cost more like 650-750 for a decent 2 sided heavyweight vinyl. The high cost is due to the initial processing that needs to be done before a track is pressed. First there's specific mastering that has to be done so that the vinyl cuts properly, then there's the laquer, then processing. Lots to do basically and it all costs