I send most packages by 1st class package service,
sent an old marker with C02, pack, gravity hopper, pots, full camo suit thing for only £8, sending my impulse I think cost me about £12 1st class.
but hell, I'm stupid I should probably use recorded or signed for or whatever, and I probably would if it was a high-end marker or an air bottle or something.
just sold a full kit for £30, I'm not going to spend £20 on p&p, and neither are they.