The alternative to buying a really expensive lens

I just ordered a 100mm f/2.8 Macro lens for three weeks, at $15/week plus a few bucks for insurance and $20 shipping. The total cost for almost a month with a macro lens? $70. Not bad for a lens that normally costs $450. A great try-before-you-buy option. Not that I can afford one at this point anyway…I’m just worried that having it around will really make me want one.