how can I substitute...?

honestly it will come out fine without the beans just make sure to poke the crust with a fork a few times.

Pricking the bottom of the pie is a common way of avoiding the dry beans method. Using another pie plate is fine if it has a vented base and it will not stick to the crust. Marbles are usually okay, but I have heard of them shattering, leaving a little special seasoning to your pie crust.

I got sick of throwing out beans and having leaky pies, so I ordered pie weights from some fancy-cook catalog. They work great and are on a string, so I just pick-up one end and put the whole thing back in its tin after baking.

I never use beans to weigh down a pie crust. I always just prick it really well with a fork to let steam out, and it comes out great.

I know this won't help you now, but you can buy pie crust weights:

http://www.amazon.com/s/?ie=UTF8&keywords=pie+weig...

For now, poke it with a fork and it will let the air out and bake just fine!

rice or another pie plate. I have never done either and I have baked a lot of pies during my 40 years of cooking.

Another pie plate!!

Try some marbles.