HELP PLEASE!!!?(20 characters)?

I want to get this beautiful black orchid betta that I saw at this one fish store. He is $20 which is a little spendy but I dont care! I dont have much room to put it so I'm going to keep it in a 2.5 gallon tank with a 10-25 watt heater and tetra whisper 3i filter. How much would it cost to buy the fish, filter, heater, and the tank (this is the what I want except 2.5 gallons not 15: a href="http://www.google.com/imgres?imgurl=http://www.teskepetandgarden.com/prodimg/10010.jpg&imgrefurl=http://ontario.inetgiant.ca/Sudbury/AdDetails/15-Gallon-Fish-Tank-With-Gl-Lid-Extras-Sudbury-40-00/3785237&usg=__SxeqiFZ5UnYI5_timNaTUjKOIuI=&h=400&w=400&sz=21&hl=en&start=0&sig2=lj1dssNCYddRK8YzDFejdA&zoom=1&tbnid=-VGqJsMX-hlreM:&tbnh=124&tbnw=122&ei=cYCBTfefAoaY0QG-5uT4CA&prev=/images%3Fq%3D2.5%2Bgl%2Bfish%2Btank%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1260%26bih%3D541%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=116&vpy=70&dur=1030&hovh=225&hovw=225&tx=128&ty=115&oei=cYCBTfefAoaY0QG-5uT4CA&page=1&ndsp=23&ved=1t:429,r:0,s:0" rel="nofollow"http://www.google.com/imgres?imgurl=http…/a ). About how much will this cost? I have $55 right now going towards it. I want to get the fish soon because I'm afraid someone else will bye it or it will die.