Amazon has it for $17.
https://www.amazon.com/dp/B00VXQG23O/
I've had some good results using this fungicide: https://www.amazon.com/Southern-Ag-Friendly-Biological-Fungicide/dp/B00VXQG23O/ref=sxts_rp_s_a_sp_1_0?adgrpid=113534690088&content-id=amzn1.sym.8947a61d-f8de-4667-bf86-26743c3affd1%3Aamzn1.sym.8947a61d-f8de-4667-bf86-26743c3affd1&cv_ct_cx=southern+ag+fungicide&hvadid=557278498951&hvdev=m&hvlocphy=9011925&hvnetw=g&hvqmt=e&hvrand=6785022788510701320&hvtargid=kwd-331416530054&hydadcr=6127_13158941&keywords=southern+ag+fungicide&pd_rd_i=B00VXQG23O&pd_rd_r=9c904782-7a09-4a39-ba2d-e5b1c038f5c6&pd_rd_w=NThgK&pd_rd_wg=slBCd&pf_rd_p=8947a61d-f8de-4667-bf86-26743c3affd1&pf_rd_r=5G9C2GZ8MJFGKBH3XA01&qid=1684969563&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sr=1-1-3a65484d-1c95-4bed-b564-9469fdeef107