Be careful buying cheap bars for Olympic lifting, the shitty cheap ones are usless, the best of the cheap ones in my opinion are the alfafit bars $380, I used them at my last comp and had a great feel to them, otherwise spend a little more, my favourite of the not super expensive bars are the Force USA bars, lifetime warranty and feel awesome to lift with, the grip isnt as grippy as the alfafit bars which is better for longer workouts as it wont tear your hands apart as quick, as for bumpers some of the cheaper ones can be out over 1kg, we weighed some cheap 20's and some were 19 some were 21, also with a platform, get 2 sheets of 15mm ply and same with rubber matting, I had a platform at my house for a while and use to rattle the whole house when dumping 100 plus kg from over head, 30mm of rubber matting makes a big difference