You can find measuring cups at Instawares, and a measuring cup set. It's unlikely that they make a 3/4 cup, because there is a 1/4 cup which can equal a 3/4 cup if used three times. So, if you can't find a 3/4 cup measuring cup, why not use the 1/4 cup three times to get to the 3/4 amount in the scoop.  

Check out Instaware
http://www.instawares.com

You may also find a 3/4 cup  at Shop at Clares http://www.shopatclares.com by entering 3/4 cup in its search.  Cups like these usually come in sets
Source(s):
http://www.instawares.com/measuring-cup-set-4.280-1329.0.7.htm?gclid=CMHU2J...;

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There are many websites that sell these individually if you would like: http://www.google.com/products?q=3/4+cup+measuring+cup&oe;=utf-8&rls;=org.mozilla:en-US:official&client;=firefox-a&um;=1&ie;=UTF-8&sa;=X&oi;=product_result_group&resnum;=1&ct;=title

If you are looking to go to a store to purchase one check out Target or Bed, Bath and Beyond... at these stores you may have to look for a measuring cup set which includes several sizes but chances are really good that you will find a set which includes this size.
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I had to search to find them also, ended up getting Tupperware ones. They come with  a lifetime warranty!
http://order.tupperware.com/pls/htprod_www/tup_show_item.show_item_detail?fv_item_category_code=10004&fv_item_number=P10056422000
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3/4 cup is 6 ounces, so just use a standard teacup. They're usually 6 ounces. You can measure it first to be sure.
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