If you have a food processor, you can easily make your own breadcrumbs! Using the crusts from loaves of bread that would have otherwise been thrown out, you can make lovely, fluffy and fresh, homemade breadcrumbs that will beat store-bought breadcrumbs any day. Best of all, your breadcrumbs will only cost you a little bit of time and electricity to make and will work out to be far cheaper than store-bought breadcrumbs.
Whenever you are down to just the crusts of a loaf of bread, put them in the freezer instead of throwing them out. I keep them in the plastic bag they come in. Make sure the bread is still in good condition (e.g. no mould) and that it hasn't yet passed its expiry date.
When you need some more breadcrumbs, or you have a decent collection of crusts, take the crusts out of the freezer and give them a few minutes to defrost.
Using the "S" blade in your food processor, place the bread into the food processor and process for a couple of minutes.
Put the breadcrumbs into a freezer bag and then pop them into the freezer until you need to use them. The breadcrumbs do not freeze in a solid lump so you can easily obtain the amount you require for your recipe straight from the freezer without defrosting.
Your frozen breadcrumbs are just another form of frozen bread so you should be able to keep them in the freezer for a similar amount of time.