A look at what is currently available on eBay
 Kensington 64327 Orbit Optical USB Trackball Mouse - Works Excellent US $19.99 
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 Finger Handheld Optical Trackball USB Computer PC mouse US $15.98
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 Kensington Orbit Optical Trackball Mouse US $2.00
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Is a trackball mouse better than an optical one?
I use a computer a lot and I use a mouse a lot and I have a fairly nice optical mouse that I have had for quite a while but I do have some wrist pains occasionally while using it so I got one the wrist pads for it and that helped a lot but now I'm in need of a new mouse and I was wondering whether a trackball would be better. I'm not a gamer so I don't need a mouse for precision. I was thinking about getting a mouse like this onehttp://www.amazon.com/gp/product/B001F42MKG/ref=pd_lpo_k2_dp_sr_2?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00006W2QD&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1SBQNEFSAZTDQZ25E8TW
If this is about comfort than yes a trackball mouse in the long run could be better for you in the long run, but this is really just a matter of preference than science. I prefer a laser mouse over optical due to accuracy (even in excel). The trackball is not my thing but it could be good for office work and help avoid CT injury with breaks.
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