1) Unfortunately on Amazon, most tube tray holder rows are 8 or 10 per row, instead of 6 / 12 / 24 which are better for E-series values. I did find some trays with 12 or more per row (and there may be more).
https://en.wikipedia.org/wiki/E_series_of_preferred_numbers#Examples
12 x 5 - https://www.amazon.com/ULAB-Scientific-Plastic-Include-UTR1015/dp/B07S67MKVZ/
12 x 5 - https://www.amazon.com/DEPEPE-Scientific-Experiments-Containers-Decorations/dp/B07Q5DZ3CR/
12 x 6 - https://www.amazon.com/Bel-Art-F18860-1013-10-13mm-Places-Polypropylene/dp/B002VA5VKQ/
15 x 6 - https://www.amazon.com/90-Tube-13x100mm-Clear-Plastic/dp/B01M5G3SYZ/
12 x 8 - https://www.amazon.com/Bel-Art-F18765-0001-Poxygrid-15-16mm-Places/dp/B002VA5V4C/
2) Coin Envelopes are one of the cheapest axial component storage solutions, and takes up less space too. Coin envelopes are a better solutions when a person has additional less common resistance values, such as 3.01K (E48 series) or 4.99K (E96 series) or 9.88K (E192 series). When using coin envelopes, use rubber bands to bundle all values within a decade together to make it faster to find values, such as 10.0 to 99.9 ohm / 100 to 999 ohm / 1.00K to 9.99K / 10.0K to 99.9K are decade groupings.