You could loosely follow a general curriculum series (Learn at Home). I did that last year with my 2e pg son when was 6.5 yrs old. He's not a fan of workbooks either, but the 2e expert recommended we use a general curriculum series to give ds some structure. I paid from $2-10 for each grade with the general curriculum series either through a discount store, used with ebay or Amazon. I refused to pay more and now I am very glad I didn't spend a lot because ds finished the series with the year, last June.
This year he's already finished a college pre-algebra textbook and is nearly halfway through a college algebra textbook; he's 8 in a week. I picked up one textbook for $1; the other for free - and that's why I'm using them. They just happened to be college level. I didn't intend to buy college level. I got them because they were $1 or free. But they've been working out better than anticipated so I can't complain.
We've also been reading a couple of chapters in a book or two each day. I read a page; then ds reads a page. I tend to find books at or above his level that he would like but would not necessarily choose. He's constantly reading books so it's not a question about comprehending or gaining knowledge, but more for some structure and pleasure together. We both loved reading the full, unabridged version of Alice in Wonderland.
For social studies, we've watched Michael Palin's series on Himalaya and am watching Michael Wood's series on The Story of India - both of which ds has really enjoyed and which are freely available through our public library. Ds is constantly reading history books so I'm the least bit worried there.
I second using Rebecca Rupp's book for guidance. It's useful to have as a guide or to double-check any doubts or fears, though it's a bit dated now. It can give you ideas too.
My son used Dreambox when he was in a gifted school for kindy but quickly accelerated through it. Ditto for Brain Pop and other programs.
At the moment, I'm avoiding shelling out any money and doing anything in my power to find free or open educational materials to fill the void. There's tons today. Some are more educational and rigorous than others. I'm trying to get ds to do more creative, open-ended, self-directed or project-based learning with things like blender.org and MIT's Scratch. There is a site and book - project-based homeschooling - which might be useful too.
