All hope is not lost for that series to continue.

Moose Toys typically releases a new "The Grossery Gang" series this time of the year, as seen in their release chart below:

1 June 2016
2 January 2017
3 June 2017
4 December 2017
5 June 2018

Their official website, YouTube channel, and third party sources doesn't have any information on whether they'll continue that series.

Sales for that series in my local stores has plummeted with each release. Most of those stores stopped selling that series altogether.

I suspect Moose Toys is going to reduce that series to an annual release. It should have been that way to begin with...