Sauce – buy online spices, sauces, extracts, etc. with international shipping

Where did you look? Here in Belgium we can find in the supermarket (in cans or frozen). We also have it fresh on some markets.

Maybe this can help you. Here is a similar thread.

If you really can't find it, you can always buy seeds and put them in your garden.

The price of genuine-sealed-and-certified parmagiano reggiano is quite high and fairly consistent, especially for more aged varieties. I think your best bet to save money will be to use a similar parmagiano reggiano cousin, such as grana padano, romano, or a quality Argentinian reggianito. As a second-tier approach, you might look at domestic Parmesan, but use caution as it may not have the same quality as a one of the Italian imports.

As for genuine Parmesan: you're buying at least a couple hundred dollars of cheese, and this gives you some bargaining power. Buy or ask to taste a small sample of whatever you're considering, and try to negotiate; managers may be willing to offer you a bulk discount. I'd gather a couple quotes from cheese shops, try prices at your local Costco/Sam's Club, and talk to the upscale grocery stores in your area.

As far as pricing goes, I've seen genuine-seal-and-everything Parmagiano Reggiano on sale at about $12-13/lbs at my local Southern Season. I generally expect to pay $18-22/lbs at upscale grocery stores for Parmesan, with remarkably little variation between stores. Your standard grocery stores tend to sell small blocks of inferior-quality and freshness Parmesan for similar prices.

In contrast, grana padano runs around $12-13/lbs on average at my local Trader Joe's, and might be available for under $10/lbs with a good sale. I usually buy blocks of that for general cooking use, as it is close enough in taste and much cheaper.