Welcome to the forum! There are many places you can get cheap tanks. You could try
www.craigslist.org or
www.ebay.com or
www.glasscages.com ... OR you can try looking around at petstores near you.
I got a lot of my items of
www.bigalsonline.com . Everything there seems to be very cheap. It really seems to be a great site to order from.
How big is this turtle? If it is over 4" then you will be able to tell if it is a male or female. Also, another thing to remember is that you need 10 gallons of water per inch of shell.
Look through this for some info on the costs and items you will need to purchase-
http://redearslider.com/startup.html . Owning a RES is not cheap!
