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https://www.gardeningknowhow.com/edible/fruits/gooseberries/harvesting-gooseberry-plants.htm

Sawfly larvae cause severe damage to bushes by devouring the leaves. Often complete defoliation will occur.
Prune bushes so that they have an open structure which allows good airflow. Sawfly prefer to lay their eggs into dense bushes. Bushes can also be covered with a horticultural fleece as they are self-pollinating.
Check bushes regularly for leaf damage and remove any larvae that can be found. Where the infestations are severe, as a last resort organic Pyrethrum-based products are available from garden suppliers. These will need to be applied following the label instructions.
During the winter months, dig around the base of bushes to expose the overwintering pupae to insectivorous birds and other predators.

Since the larvae that do the damage emerge from the soil, using a row cover is preventative only if you had no sawflies last year. Closely inspecting the underside of the lowest leaves weekly allows you catch an infestation early where manual control may be possible. The Royal Horticultural Society gives this advice: https://www.rhs.org.uk/advice/profile?pid=517

This article will help: https://www.gardeningknowhow.com/edible/fruits/gooseberries/gooseberry-maggot-control.htm

We don't usually recommend places to purchase. You might try your local gardening centers, or even online vendors such as Amazon, Etsy, and Ebay.

We can, however, offer an article on their care: https://www.gardeningknowhow.com/edible/fruits/gooseberries/growing-gooseberries.htm

This is very interesting! Thank you! I will pass this information on.

I have not heard or read this, myself, but if it works for you then there could be something to it.