for your but you want to buy lubricant, you can get it at someplace like a cvs or duane reed. if you cant buy lubricant (although this is not the most ideal solution) you could use something like baby oil or vaseline. you need to make sure that you read the label of anything you buy to ensure that you are not alergic to anything, and before using it on a more sensitive part of your body, test the reaction on less sensitive piece of skin like your arm.
for your vagina, one natural thing you can do is to turn yourself on before fingering... something like rubbing your clitoris to make yourself get "wet" before inserting your fingers... then insert slowly to ensure they are covered in your natural wetness before starting to finger yourself. if this does not work, again you could use the suggestion above, trying to buy lube or something of that nature. but remember to test it out first!
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