I've noticed a high demand for people wanting to buy spawning eggs in-game, so I have worked out the prices you SHOULD be paying:
6250 Noobz - Chicken, Pig, Sheep and Cow eggs.
7500 Noobz - Wolf and Ocelot eggs.
8500 Noobz - Villager and Mooshroom eggs.
These calculations were worked out correctly, so these are their values. If you think I've made a mistake, please tell me.