There are quite a few types of beads. All silica beads should work, but do not perform equally. The best performing beads for the RH ranges that we are interested in consist of Silicon dioxide tempered with Lithium Chloride, and are made by Fuji Silysia under the ArtSorb brand name. I know Mark at cigarmony.com - n2adventure on these forums - uses these beads because he has posted the performance data of his RH Beads and Puckifiers in one of my threads elsewhere (that also beat this subject to death

).
I believe that Heartfelt uses the same SiO2/LiCl beads, but I do not know for sure. His bead sheet material looks exactly like Fuji Silysia's ArtSorb bead sheet product, though.
I have no experience with the ConservaGel beads, but given the first sentence of the copy is an outright falsehood and the rest of the copy seems to make about as much sense as most cigar catalog ad copy, I wouldn't bother.
Note that SiO2/LiCl beads are generally not used for museum conservation, as there are better salts to use with Silica in the RH ranges that conservationists prefer (The SiO2/LiCl beads were developed by Fuji for museum use in Japan, when the ambient RH is 90%).
I also wouldn't bother with eBay beads because you don't know what you're getting. There are large price variations among bead types, and guess which type is the most expensive ...
The least expensive are Silica beads with no added salt, a.k.a. pearl kitty litter. These will work fine as well, you just need more beads than SiO2/LiCl beads, and you have to condition them yourself. (Conditioning is setting the RH point that the beads will work at, e.g., 65%.) The process is described on conservation sites. It is simple, but time consuming. The hard part is knowing when to stop, and that takes some practice to get right (well, it took me a few attempts before I had the RH that I wanted

. ).
I have Heartfelt beads, sheets, and many pounds of kitty litter. They all work, but all work much better when combined with active humidification, e.g., CigarOasis or Hydra.
The main advantages of Heartfelt and Cigarmony beads is that the beads are conditioned to a given RH for you, and the customer service from both places is very good. Buy'em, spray'em, and use'em. The convenience is worth the price difference for many.
If you want 70%RH, some super-absorbent-polymers from a local crafts store or garden center, plus some prop. glycol from your local pharmacy, is the best bang for the buck.
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