Yes, its simple and it’s cheap. Just search on ebay for your modem model ie E1553 with some key words like “unlock code”, and you should hopefully find some suppliers, generally in the UK.
Just purchase the item, and during paypal payment add a message that has:
IMEI no. (15 digits) (obtainable from your modems software or [...]
Continue reading about Unlock a Huawei 3G Wireless USB Modem for under AUD$10