Anyway, I have some information y'all might like...
Let's start with the chance to be selected for a full-sized sample of laundry detergent at HomeTesterClub. HTC also has a "Multi-Trial Box" which is a mystery box of several samples you could be picked to try. Both will require reviews on the site.
The PopSugar Sample Squad periodically offers samples for you to try. I've gotten one so far, and while it IS a "sample size", it was pretty generous. You just have to give feedback (a survey, if I recall).
Seventh Generation's Generation Good seems to be either an offshoot or a clone of Smiley360, in that there are a lot of forum discussions and such. Occasionally, you'll be offered a mission. I've been able to try full-sized AND samples of laundry products, plus a small pack of baby wipes. And their products are eco-friendly. Just share on social media, discussions with friends, etc.
Swaggable asks you to "want" items you're interested in trying. If your profile (and the occasional questions they ask) matches the needs of the company, you'll be sent an invite that you can accept or decline. In exchange for the sample, they ask for an honest review. I've accepted (and reviewed) two samples, and declined a third (because it was a gelatin-based candy). So I can vouch for them.
Trybe is apparently like Swaggable. I only recently joined, so I haven't gotten to try products yet. None-the-less, it looks interesting.
SocialNature is also like the above, except that they focus on healthy and natural products. They don't seem to have a lot of products yet, and mostly what they have are food and supplements. Again, I haven't tried anything through them yet.
DailyGoodieBox is another that I've signed up for, but haven't been selected. Every day, they have a set number of boxes of samples to send out. If you fit the criteria, they'll send you a box that day. As always, they would like a review. They also send out "special offers" from partners, but those go to your inbox on the site and not your email, so they're not that bothersome.
NaturallySavvy is a bit different. Their site has everything from coupons to recipes. But what's most interesting are the samples. You have to complete a "healthy living" challenge (usually consisting of a video and article, followed by a quiz and looking for a product to add to the shopping list [which you DO NOT have to buy]) in order to unlock a sample. I've ordered a couple very recently, so again...too early to vouch for them with certainty.
PowerReviews is one I just signed up for. You sign up, and if there are products available you can apply to test them. I applied for a new shower head and one other (which I don't remember but it was impressive, I recall that) the other day. They say that they can't guarantee a product, but you will get to keep whatever you do get. Worth giving it a shot, eh?
Here's a blog that offers what they consider to be the "30 best" free sample sites.
And remember, for more products and samples, please visit my Product Testing and Freebies entries (there are also a few scattered about in the miscellaneous posts, see my "My posts, sorted" entry and scroll down).
Okay, on to two potential "cash back" programs. I say "potential" because I haven't yet used them (I've actually forgotten about the one). You simply sign in and search for the store you want to buy from (even eBay) and follow the link. Purchase as normal and you'll get a percentage of your purchase back. There's CashBack Fortune and TopCashBack.
And that's all for now, thanks for reading and see you soon!