What? Let your wife or girlfriend tell you not to buy toys? Haven't you guys ever heard of the hush account? Works with paypal too.
ALSO
Learn to say "I got that in trade for parts" Once I told my girlfriend I traded some flux capacitors for an amiga 500. She didn't even blink.
She knows I have piles of electronic parts in boxes, and she dosn't know
a memory chip from a flux capacitor. I win. Just make sure if you say that
she dosn't watch back to the future anytime soon. Some day, I have a feeling with her elephant memory, I may have to explain myself.

Steven