I’ve made several very detailed posts about the alternative of using standard disposable ECG electrodes; look for my posts 322, 284, 161. I’m not posting any more there because nobody appears to be interested.
In summary, disposable electrodes work 100% perfectly. They are expensive if used once only, as designed, but it is very easy to get much more use out of them. I routinely get over 10 days per set. I made one test pulling out all the stops (except that I only renewed the gel once, I might have got more use, but the electrodes were getting scruffy anyway), and got 20 days out of one set. If properly stored (see my posts) I have had no problems with shelf life of opened or unopened bags of electrodes. At the moment I am using the electrodes at a rate of about 2 bags of 50 a year, at a discount price of £5 per short-dated bag, cheaper than headbands when Zeo supplied them. I have 7 bags left, and expect transmitter battery problems before running out (I haven’t yet found any information on battery replacement).
There has been a bit more on this topic on the thread cited above since I wrote the above; I think any further response or discussion belongs there, not here. Feel free to cite this text there if desired.