certain brand name (omitted to maintain the neutrality of this site and to keep from getting tromped on for commercialization) of key lime juice is actually pretty good. I bought two pounds of key limes once and did not get enough juice to make one daggoned pie. And they were very expensive. certain brand name is $2.25 a bottle and that makes half a dozen very acceptable pies. BTW, the recipe is drop dead easy:
1/4 cup of certain brand name key lime juice
3 egg yolks
1 15 oz. can of sweetened condensed milk
mix the above and pour into graham cracker crust pie shell.
Bake at 350 for 15 minutes to set the custard, which is what the mixture really is.
Garnish with paper-thin slices of limes arranged to your individual taste and serve cold, with a glass of Chateau Yquem, preferably 2003 vintage. (a mere $125 for a half bottle will get that for you at retail, but be prepared to pay $250 to $300 for a half bottle at a good restaurant.)
