You don’t want to eat eggs every day but you do want bread every morning? I suspect repetitiveness isn’t the problem. It’s the carb withdrawal making you crave breakfast toast. That being the case, you might want to try varying your breakfast with something that is not the drug that drove you to BSD rehab in the first place. Greek yogurt and berries, say, or coconut cream chia pudding or smoked salmon with capers and a thinly sliced green onion drizzled with 14 grams of cream cheese thinned out with the juice of half a lemon. Break out of the mold a little. It’s rewarding, I promise you.
To answer your question, there are commercial low carb breads out there, yes. I used them as a crutch quite often when I first started the BSD. Eventually I found I no longer cared enough to bother with the expensive online orders and since I love to cook and have easy access to ingredients, when I do want a “bun” for a burger or a buttered muffin with my omelette I just make one. I gather from your Sainsburys and £10 references that you are in the UK. All my sources are US-based, but these sites have a couple of options for you: https://www.carblife.co.uk/carblife-bakery/ , http://www.sugarfreemegastore.com/acatalog/Fresh-Bread.html . I’ve tried several Great Low Carb Bread Company products and the plain bagels aren’t bad at all. Also Joseph’s Mini Pita Bread and Mama Lupe’s Tortillas.