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I looked into all the external GPS that is compatible with Esri Collector App (as per their website) and summarized their prices and accuracies below:
|Eos Arrow 100 GNSS||60 cm||$2,995.00||http://www.eos-gnss.com/arrow-100/#1457111287037-5f435b5a-f6e1|
|EOS Arrow Lite GPS||60 cm||$1,995.00||http://www.eos-gnss.com/arrow-lite/|
|Eos Arrow 200 GNSS||1 cm||$6,995.00||http://www.eos-gnss.com/arrow-200/|
|CHC X 20i||$3,765.00||http://www.resourcesupplyllc.com/shop/products/gnss-receivers/x20i/|
|Dual XGPS 150A||2.5 m||$99||http://gps.dualav.com/explore-by-product/xgps150a/|
|Dual XGPS 160||2.5 m||$139.95||http://gps.dualav.com/explore-by-product/xgps160/|
|Geneq SxBlue II||60 cm||$1,695.00||http://www.sxbluegps.com/product/sxblue-2plus-gnss/|
|Geneq SxBlueIII||1 cm||$6,195.00||http://www.sxbluegps.com/product/sxblue-iiiplus-gnss/|
|Trimble R1||< 1 m||$2,500||https://www.trimble.com/mappinggis/r1-gnss-receiver.aspx|
|TrimbleR2||4 - 30 cm||$8,995||http://www.trimble.com/mappingGIS/R2-GNSS-Receiver.aspx?tab=Features_and_Benefits|
|Bad Elf GNSS Surveyor||1 m||$599.99||https://bad-elf.com/collections/bluetooth-gps/products/be-gps-3300|
|Bad Elf GPS Pro||2.5m (9 ft)||$199.99||https://bad-elf.com/pages/be-gps-2200-detail|
|Bad Elf GPS Pro+||2.5m (9 ft)||$299.99||https://bad-elf.com/pages/be-gps-2300-detail|
Correct be if I am wrong, but although submeter accuracies can be obtained with high-end GPS, Collector App does not claim an accuracy less than 5m in its current version.
Small Correction: The 5m floor you are referencing is true of positional data that is passed through the corelocation framework to apps making the call for positional data. When collector makes calls for data directly from external GPS Receivers this limitation isn't present. Direct integration with Bad Elf Devices occurred last summer and I know Esri has done the same with other hardware manufacturers: GPS receiver support—Collector for ArcGIS | ArcGIS
Collector just needs to be configured to use the device you've chosen to supply the more accurate data stream, our help article on this process can be found here: Configuring Esri Collector for ArcGIS - Bad Elf
The latest version of Collector (v10.4) now has Location Profile settings that enable it to work at sub-meter, sub-foot and Centimeter level accuracy levels from external high accuracy receivers. These version updates from ESRI occurred in July (for iOS), Aug (for Win 10) and Oct (for Android).
For Trimble devices (the R1 and R2) your local Reseller can walk you through the settings needed to initially configure Collector to achieve these results. The R1 is sub-meter. The R2 has several models; from sub-meter to Centimeter capable and prices range from $2,700 to around $12,000 depending on accuracy desired and correction source.
Here is a list manufacture / accuracy comparisons done by the USDA Forrest Service. (Open, Medium, & Heavy Canopy)
You might consider the Arrow 100 GNSS Arrow 100 - Eos Positioning System . It provides 60cm accuracy (2dRMS, 95%) with just free WAAS signal. If connected to an RTK Network then you'll get subfoot with the same receiver. It supports all current constellations concurrently: GPS, Glonass, Galileo and BeiDou. It is fully compatible with Collector running on iOS, Android and Windows. You might want to take a look at some performance results here Comparison Results of Field-Tested Submeter GNSS . You may want to inquire Contact - Eos Positioning Systems to get in touch with your nearest dealer and take it for a trial.