T-shirt Designer for website

ok..i want a T-Shirt Designer made for my website like the one here:[login to view URL] or [login to view URL] something like these... or any other t-shirt software that can be integrated into my website. Please provide me with examples if you have done something like this and also if there is some software you will use..what is it? i want to know what you will use. i have put the project cost as between $100-300 but i want to know how much you can provide it for..it can be within this range, it can be less..or someother...thats what you have to tell me and why?