When I go out of town Mrs. D would go crazy if she didn't have BOB ( battery operated boyfiend ). For her I would recommend a vibrator.

For a the two of you I would recomend the restraints and whips. Its interesting what you learn about yourselves when you tie someone up. We learned that we are both submissives, with me being somewhat more than her. We usually end up with her tied up telling me what to do to her ( she enjoys being spanked).
If price is a problem instead of buying all the parifnalia, use neck ties for restraints, blindfolds and use your hand or a belt for spanking her.