budget

I am wanting to purchase my first electro marker but I am stuck with this problem; if I buy an axe I will not have the money to buy a carbon tank so I will have to get a aluminiun on instead, but if I cut down on the marker and buy a mini I will save enough money to buy a carbon tank. Which...

I'm thinking of getting a pistol to play at rental sites with my mates as that would be a lot of fun. I've got my own mask and I know how much co2 will cost me. What pistol can I get second hand for about £50 or over, or is that just not possible ?