The new glue-in-place (that's the only way I can descirbe them) sheets have been a Godsend to me as far as tomato paste goes. I open a can, use what I need, & then spoon out tablespoon-fulls on one of those sheets, cover it with another sheet, & squeeze out the air between all the little tablespoons. It works FANTASTICALLY!! Just this past weekend I was able to "cut out" two tablespoons of frozen tomato paste to use in a recipe.
I've also used this stuff for freezeing leftover canned chipotle peppers in adobe sauce. Works great.
I also alway have a "tube" of tomato paste in the fridge for those recipes that just call for a small dollop or so.