im looking to build/buy a simpleish bot
First you will have to decide what weightcalss your bot is going to be In , for you i would go for a 12kg featherweight , the only other popluar option is the 100kg heavyweight , but the cost alot of money.

with most likely a spinning weapon as i have herd thats the most simple weapon choice

A simple bot for you would be a rambot , a basic heavily armored bot with 2wd or 4wd. A spinning weapon is now way easy for a first time builder , they can be difficult to build and also very dangerous to operate !
And also due to recent rule changes it will be hard for you to find an arena to fight in with a spinning weapon . Its better to go simple with your first bot.

anyone any ideas what sort or price i could pick one up for or would it be alot cheaper to build it myself?

There are not many featherweights that go on sale , maybe rarely it happens. Some people on this forum have companies that will build you a robot ,
they are James Baker of X Bots and James Cooper of RoboChallenge , they can build a bot for you but no idea about the price .Building your own is the most popular option as it lets you design whatever you want and you gain experience while building that you can carry on to other robots

but i realy suck at electrical and radio stuff

I suck at that aswell so ill let more experienced roboteers talk about it