Disabled Need to get a Hoveround

Hello , I am a 64 year old . Back in August 2013 i messed my left knee up . I had got up on my crutches to look out the door . When i turned around my knee give way and i fell . I dislocated my left knee . Tore all the tendens that hold my knee cap on . I went to doctor . He reviewed my Xrays from the emergecy room . Told me how bad it was and he couldn't operate on me . Other words i would never walk again . I can not stand up at all . I have been bedfast 16 months now .
Crutches no good for me . My knee cap flops around . It doesn't hurt . I bought two wheel chairs that broke down after using them . Last one broke the wheel clean off .
My problem is a wheel chair will not help me anymore .
I hate to admit it but i weigh 500 pounds or more . So this time i need to get a power chair like a Hoveround that is built to hold up to my weight .
Medicare will pay 80 % but that leaves me with 1200 dollars i don't have living on Disability . I can imagine some of you know what thats like .
Do any of you know what its like to be bedfast . I know some of you do . I have been out of my house 6 times in the past 16 months just to see my doctor .

I am hoping some of you could donate some to help me out . At least to get close to my needs . I have never asked for help in my life . But i do need help now . Thank You in advance . Please help !

Singed : Wayne Goodwin