I was at Bibina Warners Bay today, and purchased a Maggi Gluten Free Instant Rich Gravy Mix 2KG, for $5 (Normally $19.95). Best Before 13/6/2015, so it should be good for a few months. They only had about 20 to 30 left, & 1 person had purchased 4.
Further details here
Bibina Website Sorry, they don't have an online store.
355 HILLSBOROUGH RD, WARNERS BAY 2282
Phone: 02 4954 6044 Fax: 02 4954 7299
Trading Hours
Monday to Friday 8.00am to 5.00pm, Saturday 8.30am to 4.00pm
I am still using the 2kg Chicken Gravy Maggi mix I got there about 4 years ago. Three years out of date and still fine, so you'll be safe to use it for years probably :P